It would be nice to have some sort of templating system for the look and feel of the desktop client. This system would allow us to change every aspect of the client (through either some interface, or the use of standard css/html). Templates could be saved and exported / imported.
This would enable a whole new level of customization of the GroupWise client and would make users feel more at home with familiar corporate branding.
The system needs to be flexible and feature-full enough to allow deep customization (ie. change icons for every action).